甲醛在麦草亚硫酸盐蒸煮中的作用机理

Effect of Formaldehyde during Alkaline Sulfite Pulping of Wheat Straw

本文通过时麦草碱性亚硫酸盐蒸煮的研究表明，添加一定量的甲醛，有利于提高脱木素的速度和选择性，改善纸张的物理强度和漂白性能。甲醛用量的大小直接影响脱木素效果，本文确定了在亚硫酸盐甲醛蒽醌（ＳＦＰ－ＡＱ）蒸煮中甲醛的适宜用量为１％～２％，甲醛对亚硫酸钠的最佳摩尔比范围为０．２０～０．４５。比较研究了麦草在亚硫酸盐甲醛蒽醌蒸煮和碱性亚硫酸盐蒽醌（ＡＳＰ－ＡＱ）蒸煮中脱木素反应历程的差别，结果表明在相同的脱木素率条件下，ＳＦＰ－ＡＱ法蒸煮所得到的浆的得率比ＡＳＰ－ＡＱ法高１％～５％。

A study on alkaline sulfite pulping of wheat straw shows that the addition of formaldehyde accelerates delignification rates and improves delignification selectivity, strength properties of the final paper and the bleachability of the pulp. The delignification is directly affected by the amount of formaldehyde added. In this paper the appropriate amount of formaldehyde to be employed in the pulping with sodium sulfite, formaldehydeand anthraquinone(SFP- AQ) is found to be 1.0-1.2%(on o. d. wheat straw), and the optimum molar ratio of formaldehyde to sodium sulfite is in the range of 0.20-0.45. Finally, a comparative study on the differences of delignification in SFP-AQ pulping and in alkaline sulfite and anthraquinone(ASP-AQ)pulping has been conducted. It is shown that pulp yields by SFP-AQ pulping are 1-5% higher than those by ASP-AQ pulping at a given delignification level.